Corrosion of Steel in Internally Sealed Concrete Beams Under Load
SourceThe ability of internally sealed concrete to prevent corrosion in reinforcement under service conditions has not yet been established. To simulate service conditions, members containing flexural cracks under either static or repeated load and subjected to a period of flushing with fresh water were considered. Corrosion of the reinforcement was induced by daily applications of a 3 percent sodium chloride solution.
The results based on half-cell potentials showed that the corrosion of the reinforcement in internally sealed concrete exposed to salt water was dependent on the type of loading. Under static load, no corrosion of the steel occurred. Under repeated load, however, the corrosion of the steel in internally sealed beams and in beams of conventional concrete occurred at the same time. This indicates that internally sealed concrete may offer only limited protection for members subjected to repeated loads. The lack of correlation between half-cell potentials and rate of corrosion suggests that further research in this area is appropriate.
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